<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        table,td{
            border: 1px solid black;
        }
        table{
            border-collapse: collapse;
        }
    </style>
</head>
<body>
    <table>
        <tr>
            <td>单元格</td>
            <td>单元格</td>
            <td>单元格</td>
        </tr>
        <tr>
            <td>单元格</td>
            <td>单元格</td>
            <td>单元格</td>
        </tr>
        <tr>
            <td>单元格</td>
            <td>单元格</td>
            <td>单元格</td>
        </tr>
    </table>
</body>
</html>